world of greens

Answer in one word

1.   Name the part of plant above the ground.-Shoot

2.   Name the part of the plant below the ground-Root

3.   Roots generally grow towards- Gravity

4.   The thin threads of fungi are known as- Hyphae

5.   The single root that develops from the seed-Radicle

6.   Root hairs are known as –Rootlets

7.   A pigment that helps them in trapping the solar energy – Chlorophyll

8.   Leaf blade is known as-Lamina

9.   Male part of flower- Stamen

10.                     Female part of flower- Pistil

Q2. Give reason

1.   Plants have highly branched root system

Ans. Roots take in water through their surface. The branched root system increases the area available for taking in water from soil. Therefore plants have highly branched root system.

2.   Plants have modified roots.

Ans .plant habitats are found in different environments, ranging from desert to lakes to tropical rain forest, Hence, their organs are modified to suit the environment.

3.   Cactus can survive in hot condition

Ans. Cactus can survive in hot condition Because cactus have modified stem which is thick and swollen. This fleshy stems store food and allow the plant to grow in hot conditions. Its leaves are modified into spines to reduce water loss.

4.   Plants such as gourds and grapevine have tendrils.

Ans. Plants such as gourds and grapevine have tendrilsbecause their stems cannot stand erect so there thread like structures called tendrils. These tendrils coil around any surface in close proximity of the plant and offer support to the weak stems.

5.   Stomata are closed at night

Ans. Plant intake Carbon dioxide for photosynthesis and remove oxygen and water through stomata in day time. In night time photosynthesis does not happen so it remains closed at night

6.   Desert plants have spines on it

Ans Desert plants have spines on it because the spines are pointed and have lesser surface are which helps in reducing water loss.

             Q3. Write difference between

1.   Tap root and fibrous root

2.   Xylem and Phloem

3.   Parallel venation and reticulate venation

4.   Flowering and non flowering plants

H.W mark the answers in text book and give for homework.

Q4. Define the following

1.   Storage root

2.   Aerial roots

3.   Pneumatophores

4.   Nodes

5.   Internodes

6.   Storage stem

7.   Petiole

8.   Stomata

9.   Venation

10.                  Photosynthesis

11.                  Transpiration

12.                  Androcieum

13.                  Gynoceium

Flowering Plant	Non Flowering Plant
1.       They produce seeds and bear fruits	1.Donot bear flowers and fruits but produce cones which protect the seed
2.       Broad leaves	2.sharp needle like leaves
3.       Eg. Hibiscus, Rose, etc..	3.Eg: Ginkgo, fir, pine trees
4.       Found in all terrestrial and aquatic habitats	4.Mostlyfound  in cold regions.

Tap Root System	Fibrous Root System
1.     Have one main root growing downwards from the stem to the soil	1.     Do not have a main root
2.     Smaller roots called lateral roots grow from the tap root	2.Several tiny roots grow from the end of the stem
3.     Eg: mango, radish, carrot	3.Eg: Grass, coconut and onion

XYLEM	PHLOEM
1.Xylem transports water and minerals  absorbed by roots to different parts of plant.	1. Phloem carries food prepared in leaves to all the parts of plant including root.
2.Xylem transport water only in upward direction.	2. Phloem carries food in all directions.

RETICULATE VENATION	PARALLEL VENATION
1.     In this arrangement , a central vein runs from petiole to the tip of leaf and then branches into small ventricles.	1.In this arrangement, veins entering from a petiole run parallel to each other to the tip of leaves.
2.     It is found in plants like hibiscus, peepal, coriander, etc..	2.It is found in plants like maize, banana, grasses, etc..